code: def __getitem__(self, index):
      return (self.sents[index], self.mask[index]), self.labels[index]
  
imports: import logging
  import os
  import pickle
  from collections import Counter
  import numpy
  import torch
  from torch.utils import data
label_desc: Use image node_id 2 for calling the SSTDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self,  self,  self